Automatic brake for straight-lift elevators



April 7, 1925. 1,532,877

H. J. BUCK AUTOMATIC BRAKE FOR STRAIGHT LIFT ELEVATORS Filed Aug. 0,1919 3 Sheets-Sheet 1 April 7, 1925.

H. J. BUCK AUTOMATIC BRAKE FOR STRAIGHT LIFT ELEVATORS s Sheets-Sheet 2Filed Aug. 0 1919 April 7 1925; 1,532,877 H. J. BUCK AUTOMATIC BRAKE FORSTRAIGHT LIFT ELEVATORS Filed Aug. 30, 1919 3 sheets sheet 5 I1322207202 amps #62 2224 Z5246 A X Patented Apr. 7, 1925.

UNITED STATES PENNSYLVANIA.

HERMAN JOSEPH BUCK, 0E ELLWOOD CITY, PENNSYLVANIA, ssIGNoR r0. MATHEWSCONVEYER COMPANY, 0E ELLWOOI) CITY, PENNSYLVANIA, A CORPORATION OFAUTOMATIC BRAKE FOR STRAIGHT-LIFT ELEVATORS.

Application filed August 30, 1919. Serial No. 320,858.

To all whom it may concern:

Be it known that I, HERMAN J. BUCK, a citizen of the United States,residing at Ellwood City, county of Lawrence, and State of Pennsylvania,have invented certain new and useful Improvements in Automatic Brakesfor Straight-Lift Elevators, of which the'following is a specification.

This invention relates to' improvements in automatic'brakes designedespecially for use in connection with automatically operated straightlift elevators of the general type disclosed in Letters Patent of theUnited States issued to me May 6th, 1919, No. 1,302,631. v,

In elevators of this type articles or packages are usually automaticallydelivered to the carriages or platforms on the up-side of the elevator,and'automatically discharged therefrom on the down-side of the elevator.It is a frequent occurrence that more carriages on the down-side than onthe up-side will be loaded. The preponderance of load conveyed by thedescending carriages will tend to accelerate the speed of the elevator.This is particularly true where the elevator is driven by a motor whichhas a tendency to increase its speed when the load acts with it, i. e.,when the motor does not function as a generator as is the case withcertain types of motors. In the employment of this improved brake,friction is only applied when it is necessary to counteract theincreased speed due to unequal load distribution, or to stop theelevator immediately upon the cessation of the power actuation. Thisinvention provides an improved automatic brake to arrest movement of theelevator not only when the power is intentionally shut off, but alsowhen there is an accidental interruption in the power transmission.

It is the object of my present invention to provide automatic means forcontrolling,

' under such conditions, the speed of the elevator, although themechanism may be applied to other types of elevators without departingfrom my invention.

The invention consists gene-rally in the constructions and combinationshereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification:

Figure l is a side elevation of the upper part of an elevator having myinvention applied thereto, I

Figure 2 is an end elevation of the same, j

Figure 3 33 of Figure 2,

Figure 4 is a' sectional elevation, partly broken away, on line 4- 4 ofFigure3, looking in the direction of the arrows.

Figure 5 is a similar view, on line 5''5 of Figure 3, looking'in thedirection of the arrows.

Figure 6 is a detail section of. one of the,

brake members, I

is a horizontal section on line Figure 7 is an elevation of the drivingshaft upon which thebrake members are located, partly broken away, andshowing one brake member'in section on the shaft,

Fig.8 is a view similarto' Fig}- 3' showing the brake disks inengagement with the stationary brake plate,

Fig. 9lis a vertical'section on line 9.9 of F ig, 8 looking in thedirection of the ar row with a portion of the pinion and one of thebrake members partly broken away. In the drawings, 1 represents aportion of the frame-of an elevator of the general type illustrated inmy Patent No. 1,302,631, here-- inbefore referred to. 2represents thedriving shaft mounted in bearings 3 and 4, upon broken away, is alsoshown in'Figures l and I 2. The elevator carriages are secured to andsupported by the elevator chains 8.

Theelevator shaft 6 is driven from the shaft 2, through a pinion 10,gear 11', pinion 12, and a gear 13 mounted on said shaft 6.,

The pinion 10 is mounted loosely on the v shaft 2. This pinion issecured to a brake disc member 14: (see Figure 6) having an I internalscrew thread 15, a friction surface '16, and a projecting lug '17. I Anoppositely. acting brake disc member 18 (see Figure 7) provided with afriction surface 19, is secured upon a sleeve 20 that fitting theinternal threads in the mem ,22 arranged to coact with thelug 17 on ismounted upon" the shaft This sleeve is provided with external screwthreads 20 ber 14. I A spline'21 connects'the sleeve 20 andthe shaft2and causes-thesleeve and brake member to rotate with the shaft. Thebrake member '18 is provided with a lug the brake member 14; I

' A stationary brake plate 23 is arranged 'between the two brakediscmembers 14 and 18,being'providedwith an opening through which theshaft 2 and the sleeve-2O extend, andthrough which-opening the lugs-17and 22 von the brake disc members contact with each other. Thebrakeplate23 is mounted brake disc members normally are both out.

upon, suitable studs 24, securedsto the elevator frame, andusprings 25'on-said studs? plate'out of contact with normally hold said the member18. .7 I 7 The; arrangement of theparts as assem bled is shown in Figure3. The disc mem ber 14 .is screwedonto the sleeve 20. The

of contact with the. brake plate 23. y

The screw-threads- 15 in the brake member 14, and thecorrespondingthreads 20 on the sleeve 20- extend in a direction corre sponding to rthe directionof -movement of theshaft 2. For instancein Figure 1 thebelt pulley 5 and shaft 2 are indicated by ment ofthe parts will bereversed nd-nor 7 mal conditions will be restored. The brake member 18will'move fasterthanthefbrake and come in contact with'.thellug'l'l."This faster movement 1 of the brake member 18 will, through the screwthread connection between said" member I and the member f 14'; cause-thebrake members. 14. and 18: to' sepiai.

rate, and thetrain of gears beginningiwith pinion-10 will be rotatedfromsthe shares} at normal speed. The brake mechanismwilli be broughtinto action as often,. and only as often as the elevator runs or moves"faster than the speed normallyfimparted to it from. its drivingmechanism. Whenever the elevator does exceed its normal speed jthe'brakef device will immediatelywbe brought into'ac 3, 6 and 7of thedrawings,

tionary. and-the brakefplate'23 to be clamped the arrow as turning fromleft to right, and the th-reads;15 -and120 mustin this instance be righthandthreads, as shown in-Figures tion andwill check suchspeedpermitting'f the elevator to run at all times onlyat substantially. normal speed, Similarly,-when the, power is cutoff or thebeltlruns-ofl' th e driving pulley, this" novel automatic brakewillimmediately 1 function i to. stop the" ele' -f,

vator. a

v I do not limit myself to the In operation, assuming the parts to bestabetween the members 1 4 and 18, upon-applicationof power to thepulley 5 toturn said pulley andt-the shaft 2 in the direction indicatedby the arrowon Figure 1, thedetailsfof con particulars withoutdepartingfroinmyinstructionas the same may be varied in many 105.

member 18, beinglsplined to theshaft 2 will turn with said-shaft, andas-the' pinionlO and=brake member 14 are held stationary, by; engagementwith the elevator-gearing, the sleeve 20 will move away, from the plate23,

I itsthreads 20 screwing out-of the threads 15 inthe member 14asufiicient distance to cause the brakemembers to release plate 23.

. The brake member-14 and thepinion 10 will remain-stationary duringthis movenentof the brake member 18 until the said member 18, has made apartial revolution with the shaft 2' and the lug 22, on said brakemember, has in' the revolution of'said member, been: brought in contactwith the lug 1701'Ltl16-ab1'f1k8 member 14. The brake member 14 and-pinion-il0 will thereafter continue to rotate with the shaft 2 andthetrain of elevator gearing will be driven from said shaft 2, through thebrake member 18, lug 22, lug 17, brake member 14 and pinion 10, and-thiswill continue so long as the elevator operates in a normal-manner.

Should the down side of the elevator be vention: g t

' I claim as my invention: t 1. The combination, with a, driving shaft,of a pinion loosely mounted" thereon, gear; ing connected withand'drivenby said-pinion, means connecting said'shaft with said pinionfor driving said pinion from said shaft, saidmeans being arranged topermit the r pinion to exceed the speed imparted" to it by .said'shaft,a brakemechanism con nected with said pinion,.and means bring 'ing saidbrake mechanism intooperation when the speed of the pinion, exceeds't'hespeed normally imparted to itvby said driv ing shaft,- and to stopsaidpinion when the application of power to said drivin'g shaft isinterrupted or discontinued. p

v 2. Thecombinatiomin an elevator driv ing mechanism, ofa driving shaft;:a pinion mounted loosely thereon, a brake member connected with saidpinion, a brake member splinedupon said shaft, said brake members beingprovided with .means causing one member to be driven from the other,a'sta tionary brake-plate arranged between said brake-members, and meanscausing said brake members to grip said plate when the speed of saidpinion exceeds the normal speed imparted to it by said shaft, and tostop said pinion when the application of power to said driving shaft isinterrupted or discontinued,

3. In an elevator driving mechanism the combination,. with a drivingshaft, of a pinion mounted loosely thereon, a stationary brake plate,oppositely acting brake memhers arranged upon opposite sides of saidplate, means causing said pinion to be driven from saidshaft, and meanscausing 15 said brake members to grip said, plate when the pinion turnsat a speed greater than that normally imparted to it by said shaft, andto stop said pinion when the application of power to said driving'shaftis interrupted 20 or discontinued. I

In witness whereof I have hereunto set my hand this 23rd day of August,1919.

HER-MAN J OSEPH BUG-K.

Witnesses:

CLARA HENNON, REGINALD R. MILLER.

